Cisco Certified Network Associate (CCNA) Practice Exam

Which of the following statements about Frame Relay and LMI is true?

1. LMI is only used for monitoring network congestion

2. Every Frame Relay switch must support all LMI types

3. DTE and DCE must match their LMI types

4. LMI is optional in Frame Relay configurations

The correct answer is: DTE and DCE must match their LMI types

The statement that DTE and DCE must match their LMI types is correct because in Frame Relay networks, the Local Management Interface (LMI) protocol is essential for the proper operation of Frame Relay links. LMI provides necessary signaling and management functions, such as maintaining the status of the virtual circuits and managing the negotiation of parameters between the Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE). If the DTE and DCE do not match their LMI configurations, such as the LMI type, communication problems can arise, leading to issues like failed link status updates or the inability to receive status messages. This requirement ensures that both ends of the connection can correctly interpret the signaling and status messages exchanged, which is vital for maintaining the integrity and performance of the Frame Relay network. The other statements present certain inaccuracies regarding LMI usage and requirements within Frame Relay. For instance, LMI is not solely for monitoring network congestion; it also handles notifications of status and management for virtual circuits. Moreover, while it may be advantageous for switches to support multiple LMI types, it is not mandatory for every Frame Relay switch to support all types. Lastly, LMI is not optional in most configurations, as it plays a crucial